What is Loan Officer?

Legal Definition
Loan Officers, also referred to as "Mortgage Loan Originators", are people who work for banks and other financial institutions with the main objective to recommend individual and business loan applications for approval. Loan officers specialize in commercial, consumer and mortgage loans.

Although they are employed by financial institutions, they can be seen as intermediaries between lending institutions and borrowers. They solicit loans, represent creditors to borrowers, and represent borrowers to creditors.
-- Wikipedia
Legal Definition
Person authorized to act on behalf of the lender within specified limits as an official representative of a lending institution.